import 'dart:async';

import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:toast/toast.dart';
import 'package:bluetoothcontroller/bluetoothcontroller.dart';
import 'blueUuid.dart';
import 'device_name.dart';
import 'package:flutter/services.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key key}) :super(key:key);//调用父类的构造函数的话如果写在大括号里面的话会报错,添加const关键字的话如果有方法体也会报错
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        // This is the theme of your application.
        //
        // Try running your application with "flutter run". You'll see the
        // application has a blue toolbar. Then, without quitting the app, try
        // changing the primarySwatch below to Colors.green and then invoke
        // "hot reload" (press "r" in the console where you ran "flutter run",
        // or simply save your changes to "hot reload" in a Flutter IDE).
        // Notice that the counter didn't reset back to zero; the application
        // is not restarted.
        primarySwatch: Colors.blue,
        // This makes the visual density adapt to the platform that you run
        // the app on. For desktop platforms, the controls will be smaller and
        // closer together (more dense) than on mobile platforms.
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);
  // This widget is the home page of your application. It is stateful, meaning
  // that it has a State object (defined below) that contains fields that affect
  // how it looks.

  // This class is the configuration for the state. It holds the values (in this
  // case the title) provided by the parent (in this case the App widget) and
  // used by the build method of the State. Fields in a Widget subclass are
  // always marked "final".

  final String title;



  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;
  static const EventChannel _eventChannelPlugin = EventChannel('my.flutter.event/bluetooth');//定义接收底层操作系统主动发来的消息通道
  StreamSubscription _streamSubscription;//广播流来处理EventChannel发来的消息
  void _incrementCounter() {
    setState(() {
      // This call to setState tells the Flutter framework that something has
      // changed in this State, which causes it to rerun the build method below
      // so that the display can reflect the updated values. If we changed
      // _counter without calling setState(), then the build method would not be
      // called again, and so nothing would appear to happen.
      _counter++;
    });
  }
  //widget初始化之后调用
  void afterBuildCallback(BuildContext context){
    print('进入了afterBuildCallback');
    if(defaultTargetPlatform==TargetPlatform.android)//如果是安卓设备要自己主动去申请,苹果则是自动去申请
      Bluetoothcontroller.applyBlueAuth();
  }


  @override
  void reassemble() {
    super.reassemble();
    _callPlatformConnectDevice(DeviceName.WEIGHT_DEVICE_NAME);
  }

  @override
  void initState() {
    super.initState();
    _streamSubscription=_eventChannelPlugin
        .receiveBroadcastStream()
        .listen(_onToDart, onError: _onToDartError);//注册消息回调函数
    WidgetsBinding.instance.addPostFrameCallback((_) => afterBuildCallback(context));//注册一个回调函数在widget初始化完成之后调用
  }

  void _setData() async{
    var prefs=await SharedPreferences.getInstance();
    prefs.setString("myData", "ringo");
  }

  void _getData() async{
    var prefs=await SharedPreferences.getInstance();
    var data=prefs.get("myData");
    print(data);
    Toast.show(data==null?"沒有數據":data, context, duration: Toast.LENGTH_SHORT, gravity:  Toast.BOTTOM);
  }
  void _onToDart(dynamic message) {//底层发送成功消息时会进入到这个函数来接收
    switch(message['code']){
      case "80001"://如果是连接成功
        if(message['deviceName']==DeviceName.LIGHT_DEVICE_NAME)//如果是冷暖灯连接成功
          print("冷暖灯连接成功");
          //Navigator.pushNamed(context, "smart_light_controller");
        else if(message['deviceName']==DeviceName.WEIGHT_DEVICE_NAME)//如果是体重秤连接成功
          //Navigator.pushNamed(context, "weight_controller");
          print("体重秤连接成功");
        break;
      case "80002"://如果连接被手动断开
        print('connect.dart收到连接被手动断开的消息');
        //Navigator.popUntil(context, ModalRoute.withName('home'));//就直接回到主界面
        break;
    }
  }
  void _onToDartError(dynamic error) {//底层发送错误消息时会进入到这个函数来接收
    switch(error.code){
      case "90001"://如果扫描不到目标设备
        print('connect.dart收到扫描不到设备的消息');
        //Navigator.popUntil(context, ModalRoute.withName('home'));//就直接回到主界面
        break;
      case "90002"://与设备的连接断开
        print('connect.dart收到扫与设备的连接断开的消息');
        _callPlatformConnectDevice(error.details);//调用底层去连接蓝牙设备
        break;
    }
  }

  //调用底层去连接蓝牙设备
  void _callPlatformConnectDevice(String deviceName){
    Map<String,Object> dataMap;
    switch(deviceName){
      case DeviceName.LIGHT_DEVICE_NAME://如果是冷暖灯
        dataMap={
          "deviceName":deviceName,
          "uuidDataType":defaultTargetPlatform==TargetPlatform.android?BlueUuid.androidLightUuidType:null,
          "deviceUuid":defaultTargetPlatform==TargetPlatform.android?BlueUuid.androidLightUuid:BlueUuid.iosLightUuid,
          "notify_d":defaultTargetPlatform==TargetPlatform.android?BlueUuid.androidNotify_d:null,
          "notifyUuid":defaultTargetPlatform==TargetPlatform.android?BlueUuid.androidLightNotifyUuid:BlueUuid.iosLightNotifyUuid
        };
        break;
      case DeviceName.WEIGHT_DEVICE_NAME://如果是体重秤
        dataMap={
          "deviceName":deviceName,
          "uuidDataType":defaultTargetPlatform==TargetPlatform.android?BlueUuid.androidWeightUuidType:null,
          "deviceUuid":defaultTargetPlatform==TargetPlatform.android?BlueUuid.androidWeightUuid:BlueUuid.iosWeightUuid,
          "notify_d":defaultTargetPlatform==TargetPlatform.android?BlueUuid.androidNotify_d:null,
          "notifyUuid":defaultTargetPlatform==TargetPlatform.android?BlueUuid.androidWeightNotifyUuid:BlueUuid.iosWeightNotifyUuid
        };
        break;
    }
    Bluetoothcontroller.connectDevice(dataMap);
  }
  @override
  Widget build(BuildContext context) {
    // This method is rerun every time setState is called, for instance as done
    // by the _incrementCounter method above.
    //
    // The Flutter framework has been optimized to make rerunning build methods
    // fast, so that you can just rebuild anything that needs updating rather
    // than having to individually change instances of widgets.
    return Scaffold(
      appBar: AppBar(
        // Here we take the value from the MyHomePage object that was created by
        // the App.build method, and use it to set our appbar title.
        title: Text(widget.title),
      ),
      body: Center(
        // Center is a layout widget. It takes a single child and positions it
        // in the middle of the parent.
        child: Column(
          // Column is also a layout widget. It takes a list of children and
          // arranges them vertically. By default, it sizes itself to fit its
          // children horizontally, and tries to be as tall as its parent.
          //
          // Invoke "debug painting" (press "p" in the console, choose the
          // "Toggle Debug Paint" action from the Flutter Inspector in Android
          // Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
          // to see the wireframe for each widget.
          //
          // Column has various properties to control how it sizes itself and
          // how it positions its children. Here we use mainAxisAlignment to
          // center the children vertically; the main axis here is the vertical
          // axis because Columns are vertical (the cross axis would be
          // horizontal).
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headline4,
            ),
            RaisedButton(
              child: Text("setData"),
              onPressed: () {
                _setData();
              },
            ),
            RaisedButton(
              child: Text("getData"),
              onPressed: () {
                _getData();
              },
            )
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}
